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Finding the Fourth Proportional to 287.25, 396.41 and 156.26

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Solution

The fourth proportional to 287.25, 396.41 and 156.26 is: 215.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.25 : 396.41 = 156.26 : x
  2. Step 2: Convert to fraction form
    287.25/396.41 = 156.26/x
  3. Step 3: Cross multiply
    287.25x = 396.41 × 156.26
  4. Step 4: Simplify right side
    287.25x = 61,940.26
  5. Step 5: Solve for x
    x = 61,940.26/287.25
  6. Step 6: Final answer
    x = 215.63

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.